A. Configuring spring Java-based way
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We can not fully use Spring's xml way to configure, but all configured by the Java way!
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JavaConfig is a sub-project of the Spring, after Spring4 become a core function
1. The entity class User.java
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@Component：bean注入<bean id="user" class="ustc.wzh.pojo.User"></bean>
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@Value ( "xxx"): the attribute value of the injected <property name = "name" value = "Wang" />
1 //bean注入<bean id="user" class="ustc.wzh.pojo.User"></bean>
2 @Component
3 public class User {
4
5 private String name;
6
7 public String getName() {
8 return name;
9 }
10
11 //属性值注入<property name="name" value="小王"/>
12 @Value("小王")
13 public void setName(String name) {
14 this.name = name;
15 }
16
17 @Override
18 public String toString() {
19 return "User{" +
20 "name='" + name + '\'' +
21 '}';
22 }
23 }
2.Java configuration class
（1）appConfig.java：
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@Configuration: When beans.xml configuration file in, register it with the container to the Spring-managed, it is itself a @Component
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@ComponentScan ( "ustc.wzh.pojo"): Specifies the package to be scanned
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@Import (appConfig2.class): import additional profile parameters for the Java class class object configuration file
. 1 // @Configuration beans.xml configuration file corresponds, to the vessel to be registered hosted Spring, which is itself a @Component
2 @Configuration
. 3 @ComponentScan ( "ustc.wzh.pojo" )
. 4 // @Import with to import additional profiles
. 5 @Import (appConfig2. class )
. 6 public class appconfig {
. 7
. 8 // registration of a bean, bean corresponds to a tag <bean id = "user" class = "ustc.wzh.pojo.User"> </ the bean>
. 9 // method called id attribute value, the attribute value of the return type is class
10 @Bean
. 11 public the User User () {
12 is return new new the User ();
13 is }
14 }
（2）appConfig2.java：
1 @Configuration
2 public class appConfig2 {
3 }
3. Test class
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AnnotationConfigApplicationContext: entirely in Java way to configure Spring, we can only be obtained through the container AnnotationConfigApplicationContext, loaded by the class object configuration of class
. 1 public class the MyTest {
2
. 3 public static void main (String [] args) {
. 4
. 5 // entirely in Java is arranged Spring, we can only obtain a container by AnnotationConfigApplicationContext, loaded by the class object class configuration
. 6 the ApplicationContext context = new new AnnotationConfigApplicationContext (appconfig. class );
. 7 the User User = (the User) context.getBean ( "User" );
. 8
. 9 System.out.println (user.getName ());
10 }
. 11 }